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derp, forgot that table lookup can fail

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This commit is contained in:
Sven M. Hallberg 2013-05-11 21:41:53 +02:00
parent ccdb0fa85c
commit 62d48d2f5a
1 changed files with 4 additions and 0 deletions
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4
src/backends/llk.c
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@ -167,6 +167,8 @@ int h_llk_compile(HAllocator* mm__, HParser* parser, const void* params)
HParseResult *h_llk_parse(HAllocator* mm__, const HParser* parser, HInputStream* stream)
{
const HLLkTable *table = parser->data;
assert(table != NULL);
HArena *arena = h_new_arena(mm__, 0); // will hold the results
HArena *tarena = h_new_arena(mm__, 0); // tmp, deleted after parse
HSlist *stack = h_slist_new(tarena);
@ -217,6 +219,8 @@ HParseResult *h_llk_parse(HAllocator* mm__, const HParser* parser, HInputStream*
// look up applicable production in parse table
const HCFSequence *p = h_llk_lookup(table, x, lookahead);
if(p == NULL)
goto no_parse;
// push production's rhs onto the stack (in reverse order)
HCFChoice **s;